Pump



F. L. SCGTT.

PUMP.

APPLICATION FiLED APR. 23, I920.

Patanted Mar. 15, 1921,

3W 1 E) muenkpt rrEn STATES PATENT runs.

Application filed April 23,

Be it known that I, FLOYD L. zen of the United States, ton, Harris county, Texas, have invented a certain new and useful Improvement in Pumps, of which the following is a-full, clear, and exact description, such as will en able others skilled in the art to which it appertains to make and use the same.

My invention relates to pumps for use 1n deep well pumping and has particular ap plication to pumps to be used in pumping uid mixed with sand, grit or other sediment such as is commonly encountered in pumping oil or petroleum from deep wells.

The oil strata or pay sand in which petroleum is commonly found is very often a fine sand, or a rock impregnated with such sand, and in pumping the oil from the ground the liquid is found to be accompanied by more or less of the sand which is usually very hard. The result is that the working parts of the plunger and contacting surface of the working barrel of the pump become quickly worn so that their efliciency is destroyed and the parts have to be withdrawn from the well and repaired or renewed.

The object of my invention is to provide a pump in which the friction between the plunger and working barrel of the pump will be eliminated, thereby preventing the excessive wear ordinarily experienced.

Another object is to provide a pump in which the necessity of a fluid tight fit between the piston and the working barrel is unnecessary, doing away with the accompanying friction and consequent wear to the pump.

Other objects bu in, a citiand advantages will appear in the description which follows and will be set forth particularly in the claims appended hereto.

Referring to the drawings forming a part of this specification, and in which like numerals of reference are applied to like parts throughout the different views, Figure l is a central longitudinal section through a well showing my device therein, certain parts thereof being in elevation for greater clearness; Fig. 2 is an enlarged transverse section on the line 2-2 of Fig. 1

In Fig. 1, I have shown my device as placed within a well, said well having a casing 8 extending downwardly toward the bottom thereof. The working parts of my pump are inclosed with a working barrel 9,

Specificationof Letters Patent.

residing at Hous-,

, the

Patented Mar. 15, 1921. 1920. Serial No. 376,129.

consisting of a length of steel pipe threaded interiorly at the upper end for coupling with a swaged nipple or coupling 10, said coupling being threaded interiorly at its upper reduced end for attachment to the outlet pipe 11. The lower end of the work ing barrel is threaded nection with a coupling member 12 which .is attached at its lower end to a straiimr 13 of ordinary construction. The central ortionof the coupling member 12 is reduce somewhat in diameter at 17 for attachment to a valve cage 14, furnishing a seat for a ball valve 15. Outwardly from the valve cage 14: is a tubular up-extending cup 16 which is attached to the coupling 12 and incloses the valve and furnishes a protection therefor. as will be later described.

I have designed a piston for use within the working barrel of my pump which is not adapted to contact with the said working barreh It is of the ordinary reciprocating type and comprises a tubular member 18 threadedat the lower end for connection with a cap 19. hiscap closes the end of piston except for the central opening 20 therethrough, which furnishes attachment for a threaded member 21 to the upper end of which is attached the valve cage 22; The upper end of the member 21 furnishes a seat for a ball valve 23 adapted to open upwardly. At the upper end of the valve cage 22 is a projecting end 24 threaded for attachment to the lower end of the section 25 of the sucker rod. This member 25 is cr0ssshaped in cross sect-ion,'as shown in Fig. 2. to allow passages 26 for free upward flow of the fluid being pumped. The section 25 of the sucker rod extends upwardly to the end of the working barrel and is there threaded into attachment with the lower end of the pump rod 27, which is attached at the surface to :1V reciprocating nean's.

The upper end of the piston member 18 is flared radially outwa'dly to form an attaching flange 28 to which is secured the lower end of the expanding chamber 29; This chamber is of a bellows or accordion construction adapted to expand and contract vertically as the piston member is reciprocated. The upper end of this expanding chamber 1s connected. by a fluid tight attachment to the lower coupling member 10. The emaanding chamer comprises preferably a series of resilient metallic disks having a central opening interiorly' for con-.

end of the nipple or.

through which the sucker rod is adapted to reciprocate and are connected together in such'manner as'to allow an expansion and contractioirof the disks relative toeach other.

will be such as to allOW a stroke the piston of the length desired, and it will be, 'obvious that the longer the stroke of thepiston desired the longer will be the ex panding chamber 29. It is contemplated that the expandingmembers shall be enpanded only within their known elastic limit so that there will be 110-straining of the metal in the disks such as might ulti mately lead to a cracking or breaking of the metal therein. The joints and connections. between the disks of the expanding chamber. are fluid tight so that as the piston. is rca,

ciprocated a suction within the working barrel will be obtained in other forms of treme lower position with the upper end oi the cup-shaped member 16 surrounding the footvalve 15. This will preventa movement of the piston further than is within the elastic limit of the eirpanding'chamber 2!). l )n the downward stroke the ball valve 23 i is raised and the foot valve 15 isclosed ()il in the workingbarrel will therefore be forced upwardly within the expanding chamber 29 past the sucker rod 25, filling the expanding chamber 29 and the lower end of the outlet pipe. ()n the upward stroke the foot valve 15 will open and tllfiPlStOIl valve 25} will close and the oil filling the chamber-2!) will i be forced upwardly through the outlet pipe 11 to the surface. The oil in the strainer-.13

will be sucked upwardly past the foot valve 15 filling the lower end of the working bar-.

rel so that when the piston is again forced downwardly the oil will be confined within the working barrel and forced upwardly within the expanding chamber. Sand that is raised with the fluid into the lower end of the working barrel will tend somewhat' to settle on the downward stroke oji the plunger and might tend to lodge about the foot valve in such manner as to prevent its opening. The cup-shaped member 16 will serve to prevent the larger part of the sand from settling into contact with the foot valve, this sand tending to settle around the outer portion of the said cup. What sand The length of the expanding chamberi29 In case the J by Letters Patentis:

does enter about the valve will .be forced current within the restricted spacewithin the cup. This will hence tend to keep the foot valve free of sand which might otherwise. pack and prevent its proper functioning.

In my invention' it will be obvious that there isfno possibility for the wear of the reciprocating parts due to the entrance of sand therein. The fluid tight closure neces sary between the plunger and the working barrel of the reciprocating pump is not prescnt here. in that the closure is maintained entirely by the expanding chamber and the ,valves in com'iection therewith." The sand may obviously find entrance into the space between the disks of the expandlng chamber I but,d1ie to the inclined position of the lower disk, the contraction of the chamber will force the sand with the fluid into the central passage as the disks contract. If sand does remain in. small quantities between the disks outwardly by the strong upward current 1 which will occur due to the confining of the as they close there will be little tendency to 1 wear due to the fact that there is no rubbing.

or friction between the parts as isthe case be readily apparent without further description. V

What I claim as new and desireto protect 1 1, 1n a pu11'ip',tl1e combination of a working barrel, aifoot .valve in the lower endbetween the ordinary piston and the working barrel.

The advantages-of this form of pump will thereofpa cup-shaped member forming av chamber inclosing said foot valve and having anopen upper end,-a plunger unconiiccter-l with said chamber but limited on its downward stroke bysaid'cup-shaped member, adliiid-tight connection between said plungerand the upper end of said working barrelandmeans to operate said plunger.-

2. in a pump, the combination of a work mg barrel, it. ioot valve 1n the lower end I thereof; a plunger above said valve. compris-v ing a cylindrical tubularmember, a valve chamber therein, a fluid-tight connectlon between the upper end ol said tubular memher and the upper end of said workmg barrel and means to protect said foot valve and tolimit the downward stroke of said plunger comprising a cup open at the upper end and projecting above said foot valve.

In testimony whereof I hereunto alfix n y signature this the 19th day of April A. D.,

FLOYD. L. $60 T. 

